You are descended from creatures native to the Elemental Plane of Earth. You share some of your ancestors’ natural stability and physical power.
Benefit: Your stability grants you a +4 bonus on checks to avoid being bull rushed or tripped while standing on the ground. This bonus stacks with the benefits of similar effects, such as a dwarf’s stability.
You also gain a +1 bonus on weapon damage rolls if both you and your foe touch the ground.
Source: Planar Handbook, page 38.